Running PowerShell script that leverages Parameter Sets without any parameters - powershell

Question

How do I allow the option to run a PowerShell script that leverages parameter sets to run without passing any parameters? Is this possible?
param(
[Parameter(Mandatory=$true,HelpMessage="GenSecureFile used to generate secure password file.", ParameterSetName = 'GenSecureFile')]
[switch]$GenSecureFile,
[Parameter(Mandatory=$true,HelpMessage="GenSettingsFile used to generate settings file.", ParameterSetName = 'GenSettingsFile')]
[switch]$GenSettingsFile
)
Attempted to use a default parameter but this does not let you run the script with no parameters.

Answer 1

For this to work properly the parameter being declared as DefaultParameterSetName shouldn't be flagged as Mandatory and possibly be set to $true which wouldn't make sense for a switch Parameter. switch Parameters are meant to be optional (should not be Mandatory) and should not have a default value.
For Example:
function Test-Parameter {
[CmdletBinding(DefaultParameterSetName = 'GenSecureFile')]
param(
[Parameter(ParameterSetName = 'GenSecureFile')]
[switch] $GenSecureFile = $true,
[Parameter(Mandatory, ParameterSetName = 'GenSettingsFile')]
[switch] $GenSettingsFile
)
end {
$PSCmdlet.ParameterSetName
}
}
Test-Parameter
What you should do instead is have only one parameter that uses a ValidateSet Attribute Declaration, by doing so there wouldn't be a need for Parameter Sets.
For Example:
function Test-Parameter {
[CmdletBinding()]
param(
[Parameter()]
[ValidateSet('SecureFile', 'SettingsFile')]
[string] $Gen = 'SecureFile'
)
end {
if($Gen -eq 'SecureFile') {
# do something here when `SecureFile`
return
}
# do something here when `SettingsFile`
}
}
Test-Parameter